Completely unplayable
Tapping a character sometimes flips that character, sometimes also flips other characters, sometimes flips nothing. Undo sometimes undoes, sometimes doesn’t (but does give your turn back). It seems that undoing causes a mismatch between the actual state of the game, and what it appears it is. The state is revealed when you try to drag a character only to have them flip as well. Or it’s something else causing random character flips constantly. As it stands right now, you can’t play the game.